Heat pump system and control method therefor

A heat pump system, comprising:

• a compressor;
• an indoor heat exchanger;
• an outdoor heat exchanger, comprising a first heat exchange portion and a second heat exchange portion, wherein a flow path switching device is provided between the first heat exchange portion and the second heat exchange portion configured to disconnect or communicate the first heat exchange portion and the second heat exchange portion;
• a first four-way valve, configured to switch the flow direction of a refrigerant between the outdoor heat exchanger and the indoor heat exchanger;
• and
• a second four-way valve, configured to enable a high-temperature refrigerant to be input into the first heat exchange portion in a heating mode, so as to enable the heat pump system to operate in a heating and deicing mode;
• wherein the compressor comprises an enhanced vapor injection port and an inlet port, and in the heating and deicing mode, the second four-way valve is configured to enable the first heat exchange portion to be connected between the enhanced vapor injection port and the inlet port.